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It is also the first time Leave has lead the respected poll, commissioned by the Evening Standard newspaper.

The poll revealed only 17% of people believe George Osbourne's claim households would be £4,300 worse off after Brexit, with seven-in-ten people describing it as a lie.

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Leave campaigners are succeeding in "getting their message across", according to the poll

The Leave campaign is getting their messages across, especially on the key public concern on immigration

Gideon Skinner of Ipsos MORI

The poll also revealed immigration is now seen as the most important issue in the vote by 33% of people, overtaking the economy which has dropped to 28%.

However, despite Leave's lead, one-fifth of respondents said they may still change their mind on which way they will vote.

Gideon Skinner of Ipsos MORI said: “The Leave campaign is getting their messages across, especially on the key public concern on immigration.

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Only 17% believe George Osbourne's claim families will be £4,300 worse off after Brexit

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Bob Geldof insulting Leave campaigners

"But the Remain camp is finding it much harder to convince people that their core economic messages, both on the risks of Brexit and the benefits of staying, is going to have a personal impact on their lives.”